That is just not possible. You'd have to change Bitcoin at it's core.
Not the core, but widely utilised layers on top perhaps. I assume there'll be numerous bitcoin banks at some point.
Coinbase is already tracking coins run through them to gambling sites and shutting users down. The services that can be controlled more easily will be voluntary but very tempting for the average user.
If you are not the solely owner of your private key, you have no Bitcoin.
Nobody can seize my paper wallets.